Engine Injector Attachment Using Pressing Member and Retainer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing engine injector attachment structures struggle to securely attach short injectors to cylinder heads of varying thicknesses without requiring complex recess formations, leading to potential wobbling issues due to incomplete assembly of seal members.
Innovation Solution
The engine employs a cylindrical sleeve and pressing member configuration with a gap smaller than the seal member's thickness, allowing the injector to be pressed from outside the attachment hole, eliminating the need for deep recesses and enabling easy confirmation of seal member assembly through wobbling detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a large recessed portion is formed around the attachment hole on the top surface of the cylinder head to expose the pressed surface, then the injector can be pressed from the above even if the injector is short, but the formation of such a large recessed portion on the cylinder head may be difficult in terms of space
Solution Approach 1:
The pressing member extends the pressing action into the axial dimension by protruding from the retainer toward the injector. This allows the pressed surface to be positioned axially beyond the retainer's pressing position, enabling short injectors to be pressed effectively without requiring a large recessed portion in the cylinder head.
Solution Approach 2:
The pressing member acts as an intermediary between the retainer and the injector. It receives the pressing force from the retainer and transmits it to the injector's pressed surface, enabling the pressing action to reach the injector even when the injector is short and the pressed surface would otherwise be inaccessible.
2Length of moving object
If the injector is short, then the pressed surface is positioned inside the attachment hole of the cylinder head, but the existing structures cannot press the injector from the above
Solution Approach 1:
The pressing member utilizes the axial dimension by protruding from the retainer in the direction toward the injector. This dimensional extension allows the pressed surface to be accessed axially beyond the retainer's position, making short injectors pressable from above without modifying the cylinder head structure.
Solution Approach 2:
The pressing member serves as an intermediary element that bridges the gap between the retainer and the injector's pressed surface. It transfers the pressing force from the retainer to the injector, enabling effective pressing of short injectors whose pressed surfaces would otherwise be inaccessible inside the attachment hole.
3Reliability
If the gap between the sleeve and the pressing member is smaller than the thickness of the seal member, then assembly completeness can be verified through wobbling detection, but the structure requires precise gap control
Solution Approach 1:
The system uses the injector itself as the verification mechanism. When the seal member is missing, the injector naturally wobbles due to the controlled gap between the sleeve and pressing member. This self-verification method eliminates the need for separate detection devices or complex inspection procedures.
Solution Approach 2:
The gap dimension is controlled to be smaller than the seal member thickness, creating a specific parameter relationship that enables wobbling detection. This parameter control transforms the gap from a mere dimensional specification into a functional feature that provides assembly verification through observable injector behavior.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An engine (1) includes a cylinder head (3), a retainer (80), a pressing member (70), and an injector (40). The cylinder head (3) has an attachment hole (15) formed therein. The retainer (80) is attached to the cylinder head (3). The pressing member (70) has a pressed surface (77) configured to be pressed by the retainer (80). The injector (40) is inserted into the attachment hole (15) and has an indentation (46) configured to be pressed by the pressing member (70). The indentation (46) is arranged inside the attachment hole (15). The pressed surface (77) is arranged outside the attachment hole (15).